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By simply uploading GIAC software to your V8 M3, you can experience more power, more torque, no top speed limit and an increased rev limiter. When combined with an X-pipe exhaust, underdrive crank pulley, and an upgraded intake, you can experience an additional 50hp out of your E90 M3 when using 93 Octane. All of this is accomplished with no added noise, harshness, drivability issues, or visual clues.
It is easy to do, affordable, and sets the stage for future upgrades.
This should be the first step for anyone seeking to boost the power of their BMW.